<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        let user = prompt('请输入用户名'), passwd = +prompt('请输入密码');
        if (user === "admin" && passwd == 123456) {
            alert('登录成功')
        }
        else {
            alert('登录失败')
        }

    </script>
</body>

</html>